Office



F'. GARWI CK. VACUUM FEED MECHANISM. APPLICATION H'LED FEB. 1. 1919.

1 05393, Patented J 1115115, 1919.

I 46 f Z D? am UNITED s'rarrns earrnnr ntern e anwrcx on onxcseo, ILLINOIS.

T all who mid may concern: I

Be it known that I, FLOYD GARWICK, a citizen of the United States, residing at Chicago, in the county of Cook. and State of Illinois, have invented certain. new and useful Improvements in Vacuum Feed Mechanism, of which the following is a description, reference being had to the accompanying drawings, forming a part of this'specitication, in which corresponding numerals of reference in the different figures indicate like parts.

The objectot' my invention is 'to provide a simple, cheap and effective vacuum teed mechanism for internal combustion engines,

which shall be so constructed as to make asingle valve to simultaneously open one and close the other oftwo passages leading from a vacuum chamber,one to the intake mani' fold of the engine and the other to the atmosphere, to enable I liquid fuel to be drawn from a main .supply tank to the vacuum tank, and, in turn, to be delivered. therefromto an auxiliary container in operative communication with the engine car'- bureter. To these ends", my invention consists in the combinationot elements hereinafter more particularly described and definitely pointed out in the claims.

In the drawings,

- Figure his a vertical sectional view of combined vacuum and auxiliary tanks one within the other, showing. in connection therewitlrthe feed controlling mechanism embodying thefeatures of my invention.

Fig. "2, is a diagrammatic view in eleva tion showing a portion of an engine, a car bureter, and vacuum and supply tanks re,- spectively, and indicating the relation which they would hold to each other. Fig. 3, is a section taken uponthe lin 33 Fig. 1, viewed from beneath,

Fig. i, is a section taken. upon theline 4-4, Fig. 1. viewed .as indicated'by the arrow there shown and Fig, 5, is an enlarged view of the duplex valve. 1 i I Referring to the drawings, 1, indicates an auxiliary tank in which iswinclosed a vacuum-tank 2, hothhaving .a common top '3 which is detach-ably:secured in, place by means of screws 4 and so constructed as to form an air-tight joint. qFormed- Upon the top is a nipple 5,.whichis, ,connected by means of a pipe 6,- Fig. 2,,- avith. a main supply or storage. tank 7', upon a lower level,

vacuum. FEED rvrncnernsu.

i Specification of Lettersiatent;

from when liquid fuel may be supplied The vacuum tank 2 is provided.

thereto. 4 with an outlet tube 8, Fig. 1, leadin to the auxiliary tank lfand havinga choc -valve4! 9, at its lower end of well known construev tion, adapted to be closed when .a partial vacuum is produced in the vacuum chamber and to open when the pressure therein is equalized, to permit a-discharge "of liquid fuel from the vacuum tank into the auxil-- iary chamber. The latter is provided with a discharge opening 10, connected by means,

of a tube 11, Figs. 1 and 2, with the carbu- '70 .reter 12 of the engine 13; Saidcarbureter is. in turn, connected'in any well k'nown way, with the intake manifold 14, of the engine.

The top plate 3, isprovided with an'opening therewith which is closed by means of The part 17 is provided with a reduced vertical bore 19, which is intersected by a horizontal bore 20. terminating at'its outerend in a valve seat adapted to receive the coni cal encl.'23, ota cone shaped valve generally designated by ii. The bores"'l9, and QOdBe.

scribed constitute a vacuum passage in communication with the vacuum-tank i2, and the pipe 18 leading to said intakemanifol'dy A depending vent or equalizing memberZF), tormedupon or attached to the plate 15, in parallel relation to the membe L. vertical bore 26, is formedin the. '25, preferably'in communication with lateral bore 27, in the upper part ofl said neniber extending above said plate, which bore is in communication with the atmosphere. The lower part of the bore 26 is in communication with a horizontal bore 28, which terminates in a valve-seat adapted to fit the conical portion "29, upon "the opposite end, of the double ended valve 24. The bores 26, 27 and E28, constitute an equaliz ing passage between the vacuum-tank and the atmosphere. I Said valve is provided with longitudinal stems 3 0 and 31, which are coincident with its axis andarc adapted to slid e loosely 1n the bores 20 and 28. The

,7 ratentea'quly s, 1919. T

-.A1Sp1ication mesaebruar r1e19. semmaauau, 1

fmembers 17 and 25, between the ends of which bar is piyotall'y supported by means of a screw 37, a cam-member 3S, havmg beveled cam-faces 39 and l0'respect1vely. Sa1d cammember is formed from sheet metal and, is

provided with a laterally extended arm 11, best shown in Fig. 1, to which is attached a fioat 4:2, of cork or other suitable material. A depending armet3, Figs. 1 and 4:, integral with: said cam .member, has a horizontal portion =14, extending outwardly from its .lower end, to which is attached the lower end of a coiled spring 45, the upper end of said spring being attached-to the free end ofthe :lever 31' The lever is adapted to rest upon the upper peripheral surface of the cam 38 in position to be brought into contact alternately with the oppositely inclined cam surfaces 39 and lO/Lhereof as hereinafter described.

The auxiliary tank 1 is maintained under normal atmospheric pressure by means of a tube 16, Fig. 1, having a vent passage 17,

therein in communication with the atmosphere.

tThe operation of the device is as follows: As a result of the suction stroke in the engine cylinder, a vacuum is created through the tube 18 and vacuum passage 19, and, assuming the valve 21 to be moved to the heft-hand position, the passage 19, would be in open communication with the vacuum chamber. while the equalizing passage 28 would be closed A partial vacuum would thus be formed in the vacuum-chamber which would result in the closure of the check-valve 9.. Y

Assuming the level of the liquid fuel in the vacuum-chamber to be below the float 42, the latter would appear ina reverse position from that shown, thereby maintaining the controlling valve in the position described. The suction caused by each piston stroke would serve therefore to draw liquid fuel fromthe supply-tank 7 upwardly through the tube 6 and nipple 5 into the vacuum chamber. Upon the accumulation of asufiicient quantity to lift the float to the substantial position shown, or until the peak or high point of the cam38 shall have passed beneath the lever 34, the tension of the spring 45 acting .upon the lever 34=-\\'h10l1 is free to'be' moved downwardly and later ally, causes an instantaneous movement. of

the latter, thereby shifting the valve 24 to the auxiliary tank, to be delivered in turn to the carbureter. lVhenever the float shall have descended sufliciently to cause the peak of the cam 38 to )ass beneath the lever arm 34, the tension of the spring will I serve to shift'the lever by causing it to slide downwardly and laterally upon the incline of the cam surface 39, thereby closing the vent or equalizing passage 26 and opening the vacuum passage 19. It will thus be seen that a continuous supply of fuel will always be maintained in direct operative communication with the carbureter to meet varying conditions of load.

The fact that I am enabled to control the simultaneous opening .and closing of the vacuum and pressure equalizing passages from the vacuum-chamber by means of a single valve is .of importance. in that it results in simplicity and certainty of action. while eliminating the necessity of fine adjustments; it being understood that the valve actuating lever is always free to move the valve in either direction to its maximum limit.

Having thus described my invention, I claim:

1. A vacuum feed mechanism for internal combustion engines. comprising. in combination a vacuum tank, an engine, a fuel supply 1 tank, said engine and fuel supplytank being below the level of said vacuum tank. an auxiliary container, disposed to receive liquid by'gravity from-said vacuum tank. vacuum controlled means for opening and closing a passage between them, a carbureter in communication with the intake manifold of the engine,- a .conduit for delivering fuel from said container to said carbureter, a vacuum passage leading from said vacuum tank to the intake manifold of said engine, an equalizing passage leading from said tank to the atmosphere, said passage having oppositely disposed valve-seats, a duplex valve adapted to close one and open the other of said passages, a lever for actuating said valve, an oscillatory reversing cam for shifting the position of said lever, and a float in said vacuum chamber for actuating said reversing cam. Y

'2. A feed controlling mechanism of the class described, comprising a vacuum tank,

an engine, a fuel-supply tank, said engine andsupply tank being below the level of said vacuum, tank, an auxiliary container below said vacuum tank to receive liquid fuel therefrom, vacuum controlled means for opening and closing an opening between them, a carbureter in open communication with th intake manifold of the engine, a

conduitfor delivering fuel by gravity from said container to said carburetor, a vacuum posed valve-seats, a reciprocating valve adapted to close one while opening the other of said passages, a pivoted reversing cam, a

float in said vacuum chamber for actuating the same, a lever for actuating said valve, and a spring for yieldingly holding the same against said reversing cam. I

3. A device of the class described, in Which-is combined, a vacuum tank, an engine, a fuel 'su'pplytank, said engineand supply tank being below the level of said vacuum tank, an auxiliary container belowsaid vacuum tank toreceive liquid fuel therefrom, said container being in communication With the atmosphere, vacuum con} trolled means for opening and closing communication between said vacuum tank and container, a carburetor in operative communication with the intake manifold of the engine, a conduit for delivering fuel from said container thereto, a vacuum passage leading from said vacuum tank to said intake manifold, an equalizing passage leading from said tank to theatmosphere oppositely disposed valve seats at the beginning of said passages, a valve having cones upon the opposite ends and stems extending therefrom to slidably enter said passages, a laterally movable lever in operative connection with said valve, an oscillatory cam having downwardly and laterally'inclined faces to alternately contact with said lever, a coiled spring for connecting the free end of said lever to a stationary polnt to cause said lever to slide downwardly and laterally upon one or the other oi said inclined cam faces as the cam is oscillated in one or another direction, and a float in said tank in operative connection with said cam for shifting the same.

4. A feed device of the class described, in which is combined a vacuum tank, an engine, a fuel supply tank, said engine and supply tank being below the level of said vacuum tank, a chamber below said vacuum tank to receive liquid fuel therefrom, the same being -in communication with the atmosphere, a

check-valve interposed between the two, a carbureter in communication with the ening it longitudinally, a rave gine intake, means for fuel from said chamber theretQg-u \gaeuumfpassage m 'terposed etween. said vacuum tank andsaid I at equalizing passage leading" froin sa (1., to the atmosphere, oppo-v v alveseats in said tank at the n les ite r the entrance to passages respectively, airinterposed valve between said seats to alternately close one and open the other of s'aid passages, an oscillatory cam, a movable member inio'perative connection with said 7 valve and cam; respectively to move'said valve longitudinally when the cam is ro versed, a spring for holdin memberin y sldin eentaet'vith saidcam'; and a fl at-v In Qu ers Jive ceniiection with said cam for r vers ng the same.

n d r ve-eelthe class described, the combination with an intakemanifold of an engine and a main liquid fuel supply tank, of'a vacuum tank at a higher level than that of; said supply tank and in operative com municationj therewith, an auxiliary container open to the atmosphere and adapted to receive its supply from-said vacuum tank, a carburetor in communication With said in: take manifold, a check-valve interposed be, tween said vacuum tank and said, auxiliary container, means for delivering fuel from Said ia y container to said carb r t r, a vacuum passage leading from said vacuum tank to said; manifold, anf'equalizing passage leading therefrom to, the atmosphere, a doubleeended cone-valve arranged to move, longitudinally to simultaneously open and close n r eotheiofis'aid pas g eans.

in direct connection with said valve for move i r-. .ngcam haw ing oppositely inclined faces for alternately engaging said valve-moving means, a spring for pressing I said valve-- moving means against said cam, and a float in operative connection with said to alternately present one or the other oi said inclined faces to said valve moving means as the float rises and falls.

said movable In testimony whereof, I have-signed this specification in the presence of two. subscrib ing witnesses, th s 2,9111 lay of January 19-19. 

